Mathematical formulas in HTML 4

Many mathematical (physical, chemical) formulas can be written
in plain HTML 4 without resorting to the Symbol font or to graphics.
The symbols below can be displayed on both Mac OS 9 and
MS Windows.
If possible, place the characters one after another rather than on top of each other.
For example, write 2⁄3 [two thirds],
A¯ [closure of A],
A° [interior of A],
(SO4)2− [sulfate ion].
You may want to read also a more
detailed discussion.
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